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The documentS–1Anthropic, PBC26 OCT 2026 · 421 PP.
01The original SEC filingThe authoritative source, in your browser.SEC · HTML 02Download the saved filingThe complete 421-page document, optimized for downloading.PDF · 46 MB 03Download the full researchFindings, customer examples, calculations, and source references.Markdown

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Table of Contents

As of September 30, 2026

Cash, cash equivalents, and short-term investments

Convertible notes payable
Redeemable convertible preferred stock, par value $0.00001 
per share: 1,040,440,652 shares authorized,            issued and 
outstanding, actual; no shares authorized, issued, and 
outstanding, pro forma and pro forma as adjusted

Stockholders’ equity (deficit):

Preferred stock, par value $0.00001 per share: no shares 
authorized, issued, and outstanding, actual; 
30,000,000,000 shares authorized, no shares issued and 
outstanding, pro forma and pro forma as adjusted

Class A common stock, par value $0.00001 per share: 
10,906,111,730 shares authorized,            shares issued and 
outstanding, actual; 300,000,000,000 shares authorized, 
           shares issued and outstanding, pro forma; and 
300,000,000,000 shares authorized,            shares issued 
and outstanding, pro forma as adjusted

Class N common stock, par value $0.00001 per share: 
7,128,888,270 shares authorized,            shares issued and 
outstanding, actual; 100,000,000,000 shares authorized, 
           shares issued and outstanding, pro forma; and 
100,000,000,000 shares authorized,            shares issued 
and outstanding, pro forma as adjusted
Class T common stock, par value $0.00001 per share: 1 
share authorized, 1 share issued and outstanding, actual, 
pro forma, and pro forma as adjusted
Class F common stock, par value $0.00001 per share: no 
shares authorized, issued, and outstanding, actual; 1 share 
authorized, 1 share issued and outstanding, pro forma and 
pro forma as adjusted
Class E common stock, par value $0.00001 per share: no 
shares authorized, issued, and outstanding, actual; 
30,000,000,000 shares authorized, no shares issued and 
outstanding, pro forma and pro forma as adjusted

Additional paid-in capital

Accumulated other comprehensive income (loss)

Accumulated deficit

Total stockholders’ equity (deficit)

Total capitalization

Actual 

Pro
Forma(1)
(in millions, except for share and per share data)
$                     
$                     

$                     

Pro
Forma As
Adjusted(2) 

$                     

$                     

$                     

______________
(1) Each $1.00 increase or decrease in the assumed initial public offering price of $           per share, which is the midpoint of the 
estimated  offering  price  range  set  forth  on  the  cover  page  of  this  prospectus,  would  increase  or  decrease,  as  applicable,  the 
amount we would be required to pay to satisfy our tax withholding and remittance obligations related to the RSU Settlement by 
$          .

(2) Each $1.00 increase or decrease in the assumed initial public offering price of $           per share, which is the midpoint of the 
estimated  offering  price  range  set  forth  on  the  cover  page  of  this  prospectus,  would  increase  or  decrease,  as  applicable,  the 
amount  of  our  pro  forma  as  adjusted  cash,  cash  equivalents,  and  short-term  investments,  additional  paid-in  capital,  total 
stockholders’ equity (deficit), and total capitalization by $          , assuming that the number of shares offered by us, as set forth 
on the cover page of this prospectus, remains the same and after deducting estimated underwriting discounts and commissions 
and estimated offering expenses payable by us. An increase or decrease of 1.0 million shares in the number of shares offered by 
us would increase or decrease, as applicable, the amount of our pro forma as adjusted cash, cash equivalents, and short-term 
investments, additional paid-in capital, total stockholders’ equity (deficit), and total capitalization by $                   , assuming the 
assumed initial public offering price remains the same, and after deducting estimated underwriting discounts and commissions 
and estimated offering expenses payable by us. 

127

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  1. Founders’ letterp. 3SEC
  2. Defined termsp. 12SEC
  3. Prospectus summaryp. 16SEC
  4. Risk factorsp. 38SEC
  5. Management’s discussion & analysisp. 144SEC
  6. Businessp. 190SEC
  7. Governancep. 254SEC
  8. Executive compensationp. 275SEC
  9. Related-person transactionsp. 293SEC
  10. Principal & selling stockholdersp. 299SEC
  11. Capital-stock rightsp. 303SEC
  12. Shares eligible for future salep. 318SEC
  13. Underwritingp. 327SEC
  14. Auditor change & expertsp. 345SEC
  15. Financial statements & notesp. 347SEC
  16. Part II & exhibit indexp. 413SEC

How this was made

Read in full.
Kept in context.

A snapshot of the filing dated , rather than a live record of later events.

3primary reviewers
421pages reviewed
43image instances checked

The review

Three primary reviewers read non-overlapping ranges of the complete main filing. All 43 embedded image instances were transcribed and visually reviewed, including the founders’ letter, charts, and customer case studies. Financial tables were also checked visually for dates, units, and column alignment.

A separate reviewer checked the draft’s calculations, accounting interpretations, and customer qualifications. An additional check covered the later merged findings. The result is 62 findings and 21 customer examples.

The boundary

Companion contracts and other exhibits named in the filing’s index are separate documents and were not independently reviewed. Customer outcomes, technical benchmarks, forecasts, and scientific priority claims remain attributed company or customer disclosures.

The numbers

Dollar figures are U.S. dollars. H1 means the six months ended June 30; Q2 means the three months ended June 30. The 2026 interim financial statements are unaudited. Our calculations show their inputs and are labeled separately from reported values.

Blank fields stay undisclosed. Figures with different periods, conditions, or potentially overlapping scopes are kept separate. An earlier tender price is not an IPO price.

What the evidence labels mean
Reported in filing
A company disclosure, with the period and accounting basis retained.
Company estimate / company claim
An estimate or assertion attributed to the company, with its uncertainty preserved.
Our calculation
A derived figure using cited inputs. It is not a separately reported company metric.
Customer example
A selected case study, with its measurement limits. It is not representative ROI.
Proposed / conditional
A status qualifier for an arrangement that is not yet effective or depends on stated conditions.

About updates. This edition is tied to the October 26, 2026 filing. Any later revision should identify its new source date and preserve the basis of earlier claims.

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A closer look at the filing

Anthropic · Form S-1PDF 1

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Filed October 26, 2026. PDF is approximately 46 MB and opens only when requested. Section links may precede the exact cited paragraph.